This year, he is due to show that handsets can also be hijacked to make unauthorised calls and send text messages, running up huge bills without their owners’ knowledge. GSM networks, which are vulnerable to this flaw, are used by around 80 per cent of the world’s mobile users. Read more

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#techFT is your free daily newsletter summarising all you need to know on the latest news and trends in technology, digital media and telecoms. It provides sharp commentary and analysis and highlights the best FT writing from correspondents around the world, as well as linking to outstanding coverage around the world.

About the authors

Richard Waters has headed the FT's San Francisco bureau since 2002 and covers Google and Microsoft, among other things. A former New York bureau chief for the FT, he is intrigued by Silicon Valley's unique financial and business culture, and is looking forward to covering his second Tech Bust.

Chris Nuttall has been online and messing around with computers for more than 25 years. He reported from the FT's San Francisco bureau on semiconductors, video games, consumer electronics and all things interwebby from 2004 to 2013, before returning to London, where he is now lead writer of the #techFT daily newsletter.

Tim Bradshaw is the FT's digital media correspondent, and moved from London to join the team in San Francisco. He has covered start-ups such as Twitter and Spotify, as well as the online ambitions of more established media companies, such as the BBC iPlayer. He also covers personal tech and the advertising, marketing and video-game industries. Tim has been writing about technology, business and finance since 2003.

Hannah Kuchler writes about technology and Silicon Valley from the FT's San Francisco bureau. She covers social media including Facebook and Twitter and the dark and mysterious world of cybersecurity. Hannah has worked for the FT in London, Hong Kong and New York, reporting on everything from British politics to the Chinese internet.